|Full name||F91 Dudelange|
|Ground||Stade Jos Nosbaum,|
|League||Luxembourg National Division|
|2018–19||National Division, 1st|
It was formed in 1991 as a merger between three teams in the city: Alliance Dudelange, Stade Dudelange and US Dudelange. Domestically, it has won the Luxembourg National Division on 12 occasions and the Luxembourg Cup seven times. F91 Dudelange qualified for the 2018–19 UEFA Europa League, becoming the first club from the country to reach the group stage of a European competition.
It was formed in 1991 from the clubs Alliance Dudelange, Stade Dudelange, and US Dudelange. All three clubs had won the National Division or the Luxembourg Cup before, but each had fallen upon hard times, and the amalgamated club was expected to be more stable, in both a sporting and financial sense.
Turning the club into a title-challenging team took a while. Stade Dudelange and US Dudelange had been in Luxembourg's third tier (the 1. Division), whilst Alliance Dudelange was struggling to remain in the second league (the Division of Honour). The new club would take Alliance's place in the Division of Honour in the 1991–92 season.
F91 was promoted in its first season, and soon established itself as a competent top-flight team, not finishing outside the top half of the table until 1996–97. Towards the end of the 1990s, Dudelange gradually improved, and brought to an end Jeunesse Esch's era of dominance by storming to the 1999–00 league title by eleven points.
In 2004–05, Dudelange won the title and competed in the UEFA Champions League for the 2005–06 season. In the competition Dudelange became the first club in Luxembourg's history to reach the second qualifying round, after a remarkable victory over NK Zrinjski (they lost 0–1 at home in the first leg, in the second leg they scored a goal in the 3rd minute of stoppage time to equalize on aggregate, and then scored 3 more goals in extra time). However, Dudelange were easily beaten by Rapid Wien in the second qualifying round.
In the 2005–06 season, Dudelange completed the league and cup Double for the first time since the merger. They replicated this feat in the 2006–07 season, and won a fourth consecutive National Division title in 2007–08.
In the 2012–13 UEFA Champions League, F91 Dudelange defeated Tre Penne 11–0 on aggregate, earning them an appointment with Austrian champion Red Bull Salzburg in the second round. They defeated Salzburg 1–0 in Luxemburg, and lost 3–4 in Salzburg, to win the tie on the away goal rule. For the first time in club history, Dudelange qualified for the third round of the competition.
In 2018, F91 Dudelange became the first Luxembourgish team to reach the group stage of a major European competition, after defeating CFR Cluj 5–2 on aggregate in the UEFA Europa League play-off round. Due to Dudelange's apparent underdog status, daily newspaper Gazeta Sporturilor regarded CFR's elimination as "the biggest shame in the history of Romanian football". Dudelange had also previously defeated Polish side Legia Warsaw in the third qualifying round.
- Luxembourg National Division
- As of 9 November 2018
|UEFA Champions League||36||7||5||24||41||70|
|UEFA Cup / UEFA Europa League||26||6||5||15||23||50|
|UEFA Cup Winners' Cup||4||0||0||4||3||19|
- As of 6 February, 2019 
Note: Flags indicate national team as defined under FIFA eligibility rules. Players may hold more than one non-FIFA nationality.
- Philippe Guérard (1 July 1994 – Sept 25, 1994)
- Benny Reiter (1 July 1996 – 1 Dec 1997)
- Angelo Fiorucci (1 July 1998 – 30 June 2000)
- Carlo Weis (1 July 2000 – Sept 24, 2003)
- Roger Lutz (25 Oct 2003 – 30 June 2004)
- Michel Leflochmoan (1 July 2004 – 30 June 2009)
- Marc Grosjean (1 July 2009 – 10 June 2011)
- Claude Origer (caretaker) (15 Aug 2009 – 31 Dec 2009)
- Dan Theis (13 June 2011 – 17 Oct 2011)
- Ralph Pinatti Stange (caretaker) (18 Oct 2011 – 25 Nov 2011)
- Didier Philippe (25 Oct 2011 – 13 Nov 2012)
- Patrick Hesse (16 Nov 2012 – 30 May 2013)
- Pascal Carzaniga (1 July 2013 – 28 May 2014)
- Sébastien Grandjean (1 July 2014 – 30 June 2015)
- Michel Leflochmoan (1 July 2015 – 30 June 2016)
- Dino Toppmöller (1 July 2016 – )
- UEFA.com. "UEFA Europa League - CFR Cluj-Dudelange". UEFA.com. Retrieved 30 August 2018.
- "CFR CLUJ - DUDELANGE 2-3 // 5 motive pentru care "dubla" CFR - Dudelange este cea mai mare rușine din istoria fotbalului românesc" [CFR CLUJ - DUDELANGE 2-3 // 5 reasons why the CFR - Dudelange "double" is the biggest shame in the history of Romanian football]. Gazeta Sporturilor (in Romanian). 31 August 2018. Retrieved 19 September 2018.
- "Squad". Retrieved 9 July 2018.
- F91 Dudelange official website (in Luxembourgish)